The target directory is now called dos-8x3, not dos_8x3.

PC/make8x3.py

 #! /usr/bin/env python
 
 # This program reads all *.py and test/*.py in "libDir", and
-# copies those files with illegal DOS names to libDir/dos_8x3.
+# copies those files with illegal DOS names to libDir/dos-8x3.
 # Names are illegal if they are longer than 8x3 chars or if they
 # contain uppercase chars.  It also tests for name collisions.
-# You must first create the directory libDir/dos_8x3 yourself.
-# You should remove all files in dos_8x3 if you run it again.
+# You must first create the directory libDir/dos-8x3 yourself.
+# You should remove all files in dos-8x3 if you run it again.
 
-# CHANGE libDir TO THE CORRECT DIRECTORY.  RM dos_8x3/* FIRST.
+# CHANGE libDir TO THE CORRECT DIRECTORY.  RM dos-8x3/* FIRST.
 
 import sys, os, regex, string
 
@@ -16,7 +16,7 @@ libDir = "./Lib"	# Location of Python Lib
 def make8x3():
   reg_uppercase = regex.compile("[A-Z]")
   collisions = {}	# See if all names are unique in first 8 chars.
-  destDir = os.path.join(libDir, "dos_8x3")
+  destDir = os.path.join(libDir, "dos-8x3")
   if not os.path.isdir(destDir):
     print "Please create the directory", destDir, "first."
     err()